Polymarket captures 44% of Kalshi’s football volume within months of launch

Polymarket has clawed its way to 43.8% of Kalshi’s football trading volume, a notable benchmark for a platform that only recently entered the US sports prediction market.

The number is striking because of how quickly it materialized. Polymarket’s US arm launched in late 2025, meaning it took roughly a matter of months to reach nearly half the football volume of a competitor that had a significant head start.

The volume gap is real, but it’s narrowing

In a recent 30-day window, combined sports volume across Polymarket and Kalshi hit approximately $9.33B. Kalshi accounted for about $6.03B of that total, while Polymarket handled roughly $3.30B.

But football tells a more nuanced story. Kalshi processed over $983M in NFL contracts during Week 1 of the 2026 season alone, which ran from September 7-13. Polymarket’s NFL figures for that same stretch came in at about $27.6M.

How Kalshi built its lead

Kalshi moved into sports event contracts around early 2025 and rapidly became the default venue for regulated prediction market activity in the US. It developed combo products that let traders bundle multiple outcomes together, and integrated more effectively with traditional financial infrastructure.

Kalshi hit a record single-day volume of $2.29B in early September 2026, driven primarily by sports markets.

Polymarket’s playbook: go global, then come home

Polymarket’s international platform remains the larger liquidity venue, built on crypto rails that made it accessible to traders worldwide before US regulatory doors opened. When Polymarket launched its US arm in late 2025, it could port some of that momentum stateside.

The 2026 World Cup, which generated billions in trading across both platforms, was a natural catalyst. International football is Polymarket’s home turf in a way it isn’t for Kalshi, and the event likely helped the platform build habits among US-based traders who stuck around for NFL and college football season.

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